Insects Invading Your Home?

Bugs Getting Into the House

Sep 28, 2018
Asian lady beetles

Asian lady beetles

Purdue Department of Entomology


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It’s that time of year again! As temperatures cool, various flies, bugs, and beetles slip into your walls, and sometimes into your home’s interior, trying to find somewhere to stay warm for the winter.

They appear suddenly, seemingly out of nowhere, massing (sometimes by the thousands) on the west wall and windows of your kitchen, or perhaps as swarms of lazy flies buzzing annoyingly and aimlessly around the room.

If you live in a part of the nation where temperatures can dip below freezing from late fall into early spring, the cold-weather insect invasion can be a real nuisance.

These are the five main culprits, with links to learn more about them:


Left: Western conifer seed bug. Right: Cluster fly.  Credit: Alan T. Eaton,

Depending on the structure and exterior finish of your home, as well as environmental factors such as the surrounding vegetation around and near it, some years you may see a lot of these critters, other years, few or none.

The Good News

None of these cold-weather invaders will eat your food, bite, sting, spread diseases to people or pets, infest stored foods, eat fabrics or paper, destroy wood, or cause any kind of structural damage. (Note: The one exception is the Asian lady beetle, which is capable of biting.) What’s more, they won’t mate, lay eggs, and reproduce within your walls or inside your home. They live off their stored bodyfat until spring.

However, when swatted or squashed, stinkbugs, as the name suggests, emit a foul odor emitted by the scent glands when the insect is disturbed. When stressed or dying, a mass of Asian lady beetles may also smell bad and release a yellow fluid that can stain fabrics. Also, the feces of any large mass of insects may help trigger allergies in some people.

How do they get in?

These insects crawl in through loose siding, cracks, crevices, vents, holes in screens, etc. They may fly in through open doors and windows.

What can you do about them?

Prevention, as always, is the best way to deal with these unwelcome visitors. You know the drill: Seal cracks in doors, windows, and openings where air conditioners, plumbing, phone and TV wires enter the home with weather stripping, caulking, polyurethane foam or other appropriate materials.

Make sure your doors and windows shut tightly and keep them closed. Also window screens need to be in proper shape without any holes; keep screens shut tightly, too.

Once the insects have come inside, you can brush the crawlers into a bowl of soapy water (add a bit of detergent). This method gets rid of their odor, too.  You can also sweep/vacuum* the bugs up. If you vacuum, empty the bag or canister immediately to prevent the insects from escaping or they will simply reappear back inside the home. Swat the flies.

Please don’t spray insecticides! Most insecticides have some degree of toxicity to people, and spritzing these products around inside a home or car will increase exposure to humans and pets. Besides, you aren’t likely to kill the ones hibernating inside your walls. If you did kill some of them the scent of the dead ones might attract other insects to scavenge their remains.

The insects that do survive in your walls or attic will leave with the return of warm spring days, and it’s not likely you’ll see them in or around your home again until fall.

*Because I have a little solar greenhouse attached to my kitchen, I welcome lady beetles seeking shelter in my home. I just sweep or scoop them up and relocate them into the greenhouse to feast on the aphids that invariably show up to feast on my cooking and salad greens.

Some gardeners overwinter ladybeetle invaders in glass jars in the refrigerator and release them outdoors in spring. If you try this, spritz occasionally and lightly with water, or place a small piece of moist (not wet) paper inside the jar to prevent the insects from drying out.

See the Almanac’s pests and problem page for more insect information.

About This Blog

"Living Naturally" is all about living a naturally healthy lifestyle. Margaret Boyles covers health tips, ways to avoid illness, natural remedies, food that's good for body and soul, recipes for homemade beauty products, and ideas to make your home a healthy, safe haven. Our goal is also to encourage self-sufficiency, whether it's re-learning some age-old skills or getting informed on modern improvements that help us live better healthier lives.

Reader Comments

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Asian Lady Beetles

In the fall we have alot of Asian Lady Bettles. They are orange and black and they most definitely do bite.

Asian Lady Beetle Bites

Yes, Asian lady beetles are capable of biting! You can tell them apart from harmless North American ladybugs by look at the pattern on their heads: Asian lady beetles have a black M- or V-shaped marking on their heads.

Asian Beetle

Asian beetles are 'orange' and real Ladybugs are red. Yes Asian beetles bite.

Lady Bugs

All my adult life I've been told lady bugs don't bite . I disagree--and I get upset when I see mother's allow lady bugs to crawl on their children's little hands and think it is cute! I was hanging clothes on the line, to dry - and a Lady Bug lit on my thumb and bit Me!! It made a hole in my thumb.. like it took out a `plug'. Please mom's-- don't allow these cute bugs to crawl on your babies!!!!

Insects Invading Your Home?

This article states that none of them bite. This incorrect the Asian ladybug does bite.

Bugs in the home

Ditto what Anna said. Asian beetles BITE! I don't care for insecticides, but I do spray or spread bug killers around foundation. Better that than having a brown recluse climbing into my lap while I'm watching TV. Been there.


What can you tell me about bugs that store themselves in old wood from salvage or restoration as in old barn wood?


You can have the wood treated by temperature ie freezing or heating if it is important to you. It can be expensive depending on the quantity of wood and your location but it is possible to do. Some people reclaim wood that was from the front porch of say their grandfathers porch and it might have had some bad insect damage. It could be treated by chemical but the process would destroy the wood due to age. Some companies can use freezing and thawing at specific rates to kill all adult and larval stages of insect life without further damage to the wood and then you can treat the wood with any kind of stain or varnish to protect it you like. A friend did it and it was VERY expensive but it was for a small hallway and very sentimental so for him it was worth it to come home every day and walk in to the same boards his father had walked into as a small child. Might be worth looking into if you haven't already solved your problem.


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